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Available for Sale Securities by Collateral Type (Detail) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2014 | Dec. 31, 2013
--- | --- | ---
Investment Holdings [Line Items] |  |
Available-for-sale securities | $ 1,671,786 | $ 1,558,306
Senior Securities |  |
Investment Holdings [Line Items] |  |
Available-for-sale securities | 903,966 | 855,692
Senior Securities | Prime |  |
Investment Holdings [Line Items] |  |
Available-for-sale securities | 711,710 | 662,306
Senior Securities | Non-prime |  |
Investment Holdings [Line Items] |  |
Available-for-sale securities | 192,256 | 193,386
Re-REMIC |  |
Investment Holdings [Line Items] |  |
Available-for-sale securities | 192,596 | 176,376
Subordinate Securities |  |
Investment Holdings [Line Items] |  |
Available-for-sale securities | 575,224 | 526,238
Subordinate Securities | Prime |  |
Investment Holdings [Line Items] |  |
Available-for-sale securities | 575,067 | 526,095
Subordinate Securities | Non-prime |  |
Investment Holdings [Line Items] |  |
Available-for-sale securities | $ 157 | $ 143

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 + Details
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